Impact part 805-840 is a Motor Controller used in Impact 740-840, 840, 840I, and 840IA pressure washers. This electronic module regulates motor speed and power delivery, ensuring consistent performance and protecting the motor from overload. Replacing a faulty, erratic, or non‑functioning motor controller restores proper machine operation and extends motor life.
| Part Number | 805-840 |
|---|---|
| Part Description | Motor Controller |
| Brand | Impact |
| Fits | Impact 740-840, 840, 840I, 840IA |
| Condition | New |
The Impact 805-840 Motor Controller is an electronic control module designed for Impact 740-840, 840, 840I, and 840IA pressure washers. It governs the speed and power delivered to the motor, ensuring smooth startup, consistent operation under varying loads, and protection against overload conditions.
This controller receives input from the pressure switch, trigger, or control panel and adjusts the motor's voltage or current accordingly. It also incorporates thermal and overcurrent protection to safeguard the motor from damage. A failing motor controller can cause erratic motor behavior, failure to start, loss of pressure, or complete shutdown. Replacing it with a new, genuine controller restores reliable performance and protects your equipment.
| Speed regulation | Controls motor speed based on demand and load |
|---|---|
| Overload protection | Shuts down or reduces power to prevent motor damage |
| Pressure management | Adjusts motor output to maintain consistent pressure |
| Erratic motor behavior | Motor runs at inconsistent speeds or surges |
|---|---|
| No start / no power | Motor does not run when activated |
| Overheating / thermal trips | Controller frequently shuts down due to overheating |
| Visible damage | Burned components, cracked housing, or corroded terminals |
Impact part 805-840 is compatible with the following Impact pressure washer models. Always confirm fitment using the correct parts diagram for your exact model and revision.
| Impact Model | Component |
|---|---|
| Impact 740-840 | Motor Controller |
| Impact 840 | Motor Controller |
| Impact 840I | Motor Controller |
| Impact 840IA | Motor Controller |
When replacing the motor controller, these components are often inspected or replaced at the same time to ensure complete electrical system reliability.
Verify motor condition; a failing motor can damage a new controller.
Damaged wires or corroded connectors can cause intermittent issues.
Faulty sensors can send incorrect signals to the controller.
Copyright © 2024 AlltitanParts.com - All Rights Reserved.
